7989320689 has 15 divisors (see below), whose sum is σ = 9376679037. Its totient is φ = 6787387488.

The previous prime is 7989320683. The next prime is 7989320723. The reversal of 7989320689 is 9860239897.

It is a happy number.

The square root of 7989320689 is 89383.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 2 ways, for example, as 7436130289 + 553190400 = 86233^2 + 23520^2 .

It is not a de Polignac number, because 7989320689 - 2³ = 7989320681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7989320681) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 70701897 + ... + 70702009.

Almost surely, 2^7989320689 is an apocalyptic number.

7989320689 is the 89383-rd square number.

7989320689 is the 44692-nd centered octagonal number.

It is an amenable number.

7989320689 is a deficient number, since it is larger than the sum of its proper divisors (1387358348).

7989320689 is an frugal number, since it uses more digits than its factorization.

7989320689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 11757312, while the sum is 61.

The cubic root of 7989320689 is about 1999.1096611238.

The spelling of 7989320689 in words is "seven billion, nine hundred eighty-nine million, three hundred twenty thousand, six hundred eighty-nine".